Florian Schneider
bac82e2592
Instead of calling code object directly, call indirectly and pass the code object in a register. The object pool is then loaded from the code object. This is another preparation step for making generated code relocatable. All non-ia32 platforms: No entry patching. ARM: PC marker (now code object) moves to the same place as on x64 (below saved PP, above saved FP). R9 is now used as PP, R10 as CODE_REG. BUG= R=koda@google.com, rmacnak@google.com Committed: https://github.com/dart-lang/sdk/commit/1d343e5a7b75168fb6c9f86b64c55173cdbdc9b2 Review URL: https://codereview.chromium.org//1192103004 .
101 lines
3.3 KiB
C++
101 lines
3.3 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Class for patching compiled code.
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#ifndef VM_CODE_PATCHER_H_
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#define VM_CODE_PATCHER_H_
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#include "vm/allocation.h"
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#include "vm/native_entry.h"
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namespace dart {
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// Forward declaration.
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class Array;
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class Code;
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class ExternalLabel;
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class Function;
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class ICData;
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class RawArray;
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class RawCode;
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class RawFunction;
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class RawICData;
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class RawObject;
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class String;
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// Stack-allocated class to create a scope where the specified region
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// [address, addresss + size] has write access enabled. This is used
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// when patching generated code. Access is reset to read-execute in
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// the destructor of this scope.
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class WritableInstructionsScope : public ValueObject {
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public:
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WritableInstructionsScope(uword address, intptr_t size);
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~WritableInstructionsScope();
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private:
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const uword address_;
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const intptr_t size_;
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};
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class CodePatcher : public AllStatic {
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public:
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// Dart static calls have a distinct, machine-dependent code pattern.
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// Patch static call before return_address in given code to the new target.
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static void PatchStaticCallAt(uword return_address,
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const Code& code,
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const Code& new_target);
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// Patch entry point with a jump as specified in the code's patch region.
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static void PatchEntry(const Code& code, const Code& new_code);
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// Restore entry point with original code (i.e., before patching).
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static void RestoreEntry(const Code& code);
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// Has the entry been patched?
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static bool IsEntryPatched(const Code& code);
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// Return the target address of the static call before return_address
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// in given code.
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static RawCode* GetStaticCallTargetAt(uword return_address, const Code& code);
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// Get instance call information. Returns the call target and sets each
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// of the output parameters ic_data and arguments_descriptor if they are
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// non-NULL.
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static RawCode* GetInstanceCallAt(uword return_address,
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const Code& code,
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ICData* ic_data);
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// Return target of an unoptimized static call and its ICData object
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// (calls target via a stub).
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static RawFunction* GetUnoptimizedStaticCallAt(uword return_address,
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const Code& code,
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ICData* ic_data);
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static intptr_t InstanceCallSizeInBytes();
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static void InsertDeoptimizationCallAt(uword start, uword target);
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static RawObject* GetEdgeCounterAt(uword pc, const Code& code);
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static void PatchPoolPointerCallAt(uword return_address,
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const Code& code,
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const Code& new_target);
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static RawCode* GetNativeCallAt(uword return_address,
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const Code& code,
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NativeFunction* target);
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static void PatchNativeCallAt(uword return_address,
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const Code& code,
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NativeFunction target,
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const Code& trampoline);
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};
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} // namespace dart
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#endif // VM_CODE_PATCHER_H_
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